redwngr

Tire pressure recommendations are 'cold' pressures. They will be higher after the truck has been driven. When the 'cold pressure recommendations' were established, it was in anticipation of the increase due to drigning.

What type of lightbar are you running? Mounted on a 'sport bar'?

Shouldn't be blue tailpipe smoke no matter what the settings are. Reason I asked about tailpipes is there have been a few trucks with exhaust leaks in other locations -- and known solutions for those.

Perhaps a sensor with a bad battery?

Apple or android?

40 might be the pressure they use for shipping. As others said there will be several labels on the door post (the ones on the bottom, outside are easy to miss) One of the labels has serial number specific tire pressure recommendations -- base on tires it was born with, at maximum load. If you have the truck set-up in myGMC or myChev, the app will also show the recommended tire pressure.

Seems like your parts guy isn't up to speed.

AT4 doesn't have adaptive ride control. It's a 1500 Denali and HC only thing. (standard on Denali, optional on HC) AT4 has: Z7X Suspension, Off-Road with 2" factory installed lift and monotube shocks AT4 has: Denali has: Z45 Denali Premium Suspension with Adaptive Ride Control

Inside the mygmc app, on the phone, scrolling to the bottom finds an 'edit dashboard' box that can be selected, and inside that it can be selected/unselected as an active app.

From tailpipes or somewhere else?

https://gm-techlink.com/?p=14502 Tips for Over-The-Air Software Programming March 12, 2021 Over-the-Air (OTA) software updates (Fig. 1) that are pushed to vehicles remotely continue to expand in frequency and use on GM models. Vehicles using the Global A electrical architecture can support three modules for OTA updates, such as the radio, OnStar, and Serial Data Gateway modules. Fig. 1 The new Vehicle Intelligence Platform (VIP) electrical architecture, introduced on some 2020 and 2021 model year vehicles, powers a new electronic system that is capable of managing up to 4.5 terabytes of data processing power per hour, which is a fivefold increase in capability over the previous Global A electrical architecture. On vehicles using the VIP architecture, virtually all modules can support OTA updates, which means that the OTA software is not only for the infotainment system. When an OTA update has been downloaded to a vehicle and is available to be installed, a message is displayed on the infotainment screen notifying the driver of the impending update. The message to accept and install an OTA update will not appear until the minimum values for the battery State of Charge (SOC) and Outside Ambient Temperature (OAT) are met. OTA Software Download In order for an OTA update to be pushed to a vehicle, the vehicle must be parked for the entire download process. There is not a notification to the driver that the software update is being downloaded to the vehicle. Battery SOC and OAT values are not checked before a download. These checks are only performed once the software update is downloaded and ready to be installed. The OTA software download can occur in increments. So if the vehicle is driven during the download process, the download will be paused until the vehicle is parked and download conditions are met again. Installing an Update Once the OTA software is downloaded, a message on the infotainment screen will display a prompt to accept the installation. The customer does not need to remain in the vehicle during the installation of the software. However, the vehicle cannot be driven during the installation and certain vehicle features may not be available. It’s not required for the ignition to be ON for the installation to begin. Installation time will vary based on the size of the update. The average installation will take approximately 15 minutes. (Fig. 2) Depending on the module, it may take longer to complete. The “Accept” message on the infotainment screen will provide an estimation of the approximate installation time. Fig. 2 Deferring or Declining an Update When an OTA update is downloaded, customers have the option to defer or decline the installation. The standard policy for OTA software updates is to set the customer notifications to 30 ignitions cycles. If the customer does not act upon the prompts within this counter, the update package is removed from the vehicle. If a customer ignores the notification, the ignition cycle counter decreases by one immediately. If the customer defers the installation by selecting the “Remind Me Later” option, the ignition cycle counter decreases by one, but it will not decrease again until after the customer-selected “Remind Me Later” period, regardless of the number of ignition cycles that occur during that period. If the OTA update installation is deferred by the customer, it can be installed at a later date through the Vehicle Software menu under Settings > System on the infotainment screen. (Fig. 3) If the customer selects the “Decline Update” option, the update package is immediately removed from the vehicle. In this case, the vehicle will not be re-enrolled to receive the OTA update at a later date, unless the update is a Field Action. OTA updates will not be installed in a vehicle without a customer’s consent. Fig. 3 Unable to Complete There are a number of criteria that must be met in order to successfully complete the software update installation on a vehicle. The most common cause of being unable to complete an installation is the State of Charge (SOC) of the 12V battery. If the 12V battery does not meet the minimum SOC requirement of 70 percent or greater along with an Outside Ambient Temperature (OAT) greater than 14°F (-10°C), the OTA update installation will not occur. The colder the ambient air temperature is, the higher the target SOC becomes. To determine the battery SOC for VIP vehicles, go to BCM/12V Battery/Battery Sensor Module – State of Charge in GDS 2. There may be other conditions that will affect an OTA update installation. If any of these conditions are present, a “Vehicle Conditions Not Ideal” message may display on the infotainment screen stating that conditions are not ideal to proceed with the update installation. These conditions do not indicate a failure; only that the vehicle does not meet all the criteria necessary to complete the OTA update installation. (Fig. 4) Some customers may comment that the radio appears to stay on or is backlit after exiting the vehicle. If this occurs, it’s a telltale sign that an OTA update is in progress. Fig. 4 Proper Battery Charging If a low battery SOC is preventing the OTA update installation, the 12V battery should be charged to meet the target SOC of 70 percent. On some GM models, connecting the battery charger directly to the 12V battery posts will bypass the Battery Sensor Module, resulting in a default SOC value of 65 percent and a “Conditions Not Met” message. TIP: The Battery Sensor Module (Fig. 5) is attached directly to the battery negative terminal. It determines the battery condition by calculating the battery SOC, functions, and state of health, which is used to help determine if the 12V Stop/Start system will allow an Auto Stop when the vehicle has come to a stop. To properly charge the battery, the negative lead of the charger must be connected to chassis ground, and not directly to the negative battery post. Connecting to chassis ground allows current to flow through the Battery Sensor Module during charging as well as be monitored. Connecting directly to the negative battery post charges the battery, but the current cannot be monitored by the Battery Sensor Module. Fig. 5 If a battery is improperly charged, the Battery Sensor Learn will be required to calibrate the Battery Sensor Module. With the ignition off, let the vehicle rest for a minimum of four hours without any interruptions (opening a door, using the key fob, etc.). Verify if the battery SOC is 70 percent or greater using GDS 2 before attempting to continue with an OTA update.

I read it as just the module to run it will be gone -- but more than willing to hear more info. Can't imagine there is anyway they did full endurance testing on these engines with and without the mechanical parts to make dfm work. Again, certainly interested in any more info/details available.

??? Article says they are changing the economy label on the ones they build without the module to run afm/dfm.

I don't think I've ever logging into onstar...but it showed up in the mygmc app. After selecting a vehicle, the vehicle screen has items/apps for - key fob - vehicle status - vehicle locate. - Smart driver - wi-fi hotspot - safety and security - navigation -- and about 7 more

Are you sure it doesn't? Near as I can tell 'driving activity' section is a new 'thing' for the gmc app too.

Sorta good news/bad news. I was hoping you were going to tell us that an issue had been identified and corrected.....

2019 T1 GT4 Rear axle, 3.73 ratio On Silverado Custom - Included and only available with (BD1) Custom Max Trailering Package. On LT and RST - Included and only available with (B4U) Diesel Off-Road Package. On others - not available Not available on 2019 T1 Sierra 2019 Silverado NHT Max Trailering Package, includes 9.76" rear axle, enhanced cooling radiator, revised shock tuning for increased control, heavier duty rear springs, increased RGAWR and (KW5) 220-amp alternator On Custom - Required and only available with (BD1) Custom Max Trailering Package. On LT and RST - Requires (L84) 5.3L EcoTec3 V8 engine, (Z82) Trailering Package, (G80) locking differential and 18" or 20" wheels and tires. Includes (GU6) 3.42 axle ratio and (JL1) trailer brake controller. Not available with (Z71) Z71 Off-Road Package. On LTZ - Requires (L84) 5.3L EcoTec3 V8 engine or (L87) 6.2L EcoTec3 V8 engine and 18" or 20" wheels and tires. Includes (GU6) 3.42 axle ratio. Not available with (Z71) Z71 Off-Road Package. ON HC - Requires 4WD model and (L87) 6.2L EcoTec3 V8 engine. Includes (GU6) 3.42 axle ratio. Not available with (Z71) Z71 Off-Road Package or 22" wheels. Not available on either Trailboss 2019 Sierra NHT Max Trailering Package, includes 9.76" rear axle, (GU6) 3.42 axle ratio, enhanced cooling radiator, revised shock tuning for increased control, heavier duty rear springs, increased RGAWR and (KW5) 220-amp alternator On SLE and Elevation - Requires (L84) 5.3L EcoTec3 V8 engine, (Z82) Trailering Package, (G80) locking differential and 18" or 20" wheels and tires. Includes (JL1) trailer brake controller. Not available with 22" LPO wheels or (X31) X31 Off-Road Package. On SLT - Requires (L84) 5.3L EcoTec3 V8 engine or (L87) 6.2L EcoTec3 V8 engine and 18" or 20" wheels and tires. Not available with 22" LPO wheels, or (X31) X31 Off-Road Package. Not available on base sierra, AT4 or Denali

Another thread about this in the top 2019/2020 silverado/sierra section..

Sounds like it doesn't matter to the OP, but Base sierra, SLE and both versions of elevation get: -- Headlamps, LED reflector with incandescent turn signals and LED signature Daytime Running Lamps -- Taillamps, LED tail and stop light, with incandescent reverse light SLT, AT4 adn Denali get: -- Headlamps, LED reflector (high intensity) with LED turn signals and LED signature Daytime Running Lamps -- Taillamps, LED signature taillight, with LED stop and reverse light

Set one of the trip meters when you fill up. Next fill, use the trip MPG and the miles driven and see if that matches the gallons pumped. FWIW, mine the 'low fuel' light seems to come on somewhere around 60 miles range. Range screen changes to 'low' somewhere around 50 miles. Range estimate depends on the 'recent' fuel economy it's been getting (last 25??). Imo, they are trying to reduce they chances that someone has to walk...(I can imagine the uproar if 'they' don't warn us soon enough!!) Imo, it's good to know 'about' how much fuel is left when the warnings start.

As far as I know nobody offers an auxiliary set-up yet.. I did speak with one of them last fall about an in-frame tank and they indicated they were expecting to have something first of the year -- and of course nothing yet.... For now it looks like a transfer tank (as opposed to auxiliary in-bed or an in-frame) is the only option if extra fuel is desired. With tank ranges of +/-600 miles I've got to admit I'm less interested/concerned than was. Previous truck was 6.6 dmax (2011-2019 were 36 gallon) and gave the same range when travelling (and not towing)

Thanks for updating. You had me wondering if they had changed the brochure and deleted that info...which was why I checked ...and then posted the link.

Order guide also shows heated available for second row -- but no mention of ventilated. Even on Escalade ESV Rear air seems to be standard.

The chart on page 24 of the 2021 1500 sierra brochure wasn't what you were looking for? https://www.gmc.com/download-2021-brochure

Go to GM website and find the downloadable brochures for sierra and silverado. (or find a dealer that passes them out) They will show what is standard on each trim level and what options are available on each trim level. Sometimes a feature is optional on one trim and included on the next trim. Price both versions. When you have an idea what you think you want, you can 'build and price' it on the website. It will also list current GM 'offers'. Of course the dealer added discount (if any) and trade values won't be shown. Options can significantly add to the price. Even on top level trims there are options that can be expensive. Makes if very difficult to use just dealer websites to compare a chev vs gmc of different trim levels at different dealer..... Trim levels are similar but not identical between silverado and sierra. Makes it tough to spec them identical. The marketing types that help determine pricing are really good at making it so 'for just a little more you can add this next feature'. Good luck.